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The use of a pin protrusion inspection gauge is essential in jo-bolt inspection because it directly measures the specific dimensions and clearances necessary to ensure that the jo-bolt is properly installed and functioning within its design specifications. This precise measurement tool helps verify whether the bolt protrusion meets the required tolerances, which is critical for the structural integrity of the assembly where the jo-bolt is deployed.

While visual appearance can provide some preliminary insights into the condition of the bolt, it does not provide the accurate and quantifiable data needed to assess whether the bolt is within operational limits. Checking the manufacturer's date is more relevant to the bolt's shelf life and potential obsolescence but does not measure its current state or compatibility within a structure. Using a hammer to test strength may result in damage and does not yield a reliable assessment of the bolt's load-bearing capacity or installation conformity.

In summary, the pin protrusion inspection gauge offers a specific, quantitative method for evaluating the critical dimensions of jo-bolts, making it the most significant factor in ensuring they meet safety and performance standards.